Just a reminder that the nuclear clock is 1min. to midnight.
Keep doing NOTHING - Tic-Toc.

By saying current president of the United States of America I meant Donald Trump. Perhaps it’s partially Monica Lewinsky’s fault former intern of Bill Clinton former president of the United States of America. In case of local international politics.

Well, to stop dangerous climate change it probably already 10 past midnight. Mankind is such a burden to the planet, that even in a radioactive zone like Chernobyl, nature flourishes more than outside of it, because there's no pressure of human presence on nature. Our way of exploiting the earth is more dangerous to nature than radioactivity left on it's own.

If anything Chernobyl proves that the planet will be just fine no matter what we do to it. The people, on the other hand...

Problem is that humans are experts at making others pay for their actions. First it's all humans making other species and the ecosystem as a whole pay, then the more wealthy and powerful, and more responsible for the damage done, making those below them pay, and this happens at every "tier", not just those at the very top doing it to everyone else. Those poorer than others, weaker, of less social standing, less politically represented, or just different in whatever way, they get to pay the price for what those above them do, and for the better lives those lead.
And by the time we may be talking of the planet sorting itself out without humans, there may be little left of it to sort out, outside self-sustaining bunkers of the remaining (formerly) rich and powerful, if they wouldn't have moved to orbital stations or Moon or eventually Mars bases by then, leaving a barren wasteland behind. And while life will likely find a way to recover even from that, there is the ticking time bomb of the Sun to consider. Earth's some 4.6 billion years old, it took some 2 billion years for the fluke that allowed complex life to eventually develop to happen once, and while at the moment we're the ones doing that, in about one billion years the Sun's expansion will most likely bring about a runaway heating that will make it darn hard for complex life to exist on Earth, and in some 3 billion years it'll be inhospitable to pretty much all life, so the window of opportunity for starting over and getting back here is closing.

@Nevermourning and @Cavalary, you voiced my worries very good.

We (current gen) will be long gone before any of that happens and there's nothing we can do about most of it, so why worry?
Maybe it would be best to just sit back and enjoy life while saying thanks for all the fish.

Because as the dominant species we (most definitely should) have the responsibility to offer good conditions and good lives to all others we share this world with.
And seeing the massive negative impact we have, you can easily figure out that we could also have an at least equally massive positive impact if only we wanted to. And as time passes the tools at our disposal only increase, and I'd call it hardly too much of a stretch of imagination to say that, if we took care of both the world and human society in order to ensure conditions to thrive and continued and positive development, we'd get to a point where we could do something about even such major external events in as little as a few centuries, and by the time they'd actually have real effects on this homeworld of ours we might well be a galaxy-spanning species.
But if each only looks at what happens to them and in their life, we won't get anywhere, or at least nowhere good. "Society grows great when old men plant trees whose shade they know they shall never sit in" and all...

I wasn't saying we shouldn't try to make other people's lives or the world better, just that fretting about things millions of years off is a waste of our time compared to concerning ourselves with what we can do now.

Oh, I wasn't fretting about that, just countering the argument that the planet would be fine no matter what we do by pointing out that if we utterly destroy its life support systems now, it may not have time to get back to a similar point.

For carbon based life like us, perhaps, but there might be time for silicon rock beasts or exotic gas bags.